diff --git a/src/ifcgeom/kernels/cgal/CgalIfcGeomShapes.cpp b/src/ifcgeom/kernels/cgal/CgalIfcGeomShapes.cpp
index e3264e78ec..7b64a21321 100644
--- a/src/ifcgeom/kernels/cgal/CgalIfcGeomShapes.cpp
+++ b/src/ifcgeom/kernels/cgal/CgalIfcGeomShapes.cpp
@@ -100,8 +100,14 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcExtrudedAreaSolid *l, cgal
     nef_shape.transform(trsf);
   }
   
-  nef_shape.convert_to_polyhedron(shape);
-  return true;
+  try {
+    nef_shape.convert_to_polyhedron(shape);
+    return true;
+  } catch (...) {
+    std::cout << "IfcExtrudedAreaSolid: cannot convert Nef to polyhedron!" << std::endl;
+    return false;
+  }
+  
 }
 
 #ifdef USE_IFC4
@@ -244,8 +250,13 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcExtrudedAreaSolidTapered*
     nef_shape.transform(trsf);
   }
   
-  nef_shape.convert_to_polyhedron(shape);
-  return true;
+  try {
+    nef_shape.convert_to_polyhedron(shape);
+    return true;
+  } catch (...) {
+    std::cout << "IfcExtrudedAreaSolidTapered: cannot convert Nef to polyhedron!" << std::endl;
+    return false;
+  }
 }
 #endif
 
@@ -458,8 +469,13 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBooleanResult* l, cgal_sha
 //      fresult.open("/Users/ken/Desktop/result.off");
 //      fresult << result << std::endl;
 //      fresult.close();
-    } nef_result.convert_to_polyhedron(shape);
-    return true;
+    } try {
+      nef_result.convert_to_polyhedron(shape);
+      return true;
+    } catch (...) {
+      std::cout << "IfcBooleanResult: cannot convert Nef to polyhedron!" << std::endl;
+      return false;
+    }
     
   } else if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_UNION) {
 
@@ -475,8 +491,13 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBooleanResult* l, cgal_sha
 //      fresult.open("/Users/ken/Desktop/result.off");
 //      fresult << result << std::endl;
 //      fresult.close();
-    } nef_result.convert_to_polyhedron(shape);
-    return true;
+    } try {
+      nef_result.convert_to_polyhedron(shape);
+      return true;
+    } catch (...) {
+      std::cout << "IfcBooleanResult: cannot convert Nef to polyhedron!" << std::endl;
+      return false;
+    }
     
   } else if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_INTERSECTION) {
 
@@ -492,8 +513,13 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBooleanResult* l, cgal_sha
 //      fresult.open("/Users/ken/Desktop/result.off");
 //      fresult << result << std::endl;
 //      fresult.close();
-    } nef_result.convert_to_polyhedron(shape);
-    return true;
+    } try {
+      nef_result.convert_to_polyhedron(shape);
+      return true;
+    } catch (...) {
+      std::cout << "IfcBooleanResult: cannot convert Nef to polyhedron!" << std::endl;
+      return false;
+    }
   } return false;
 }
 
diff --git a/src/ifcgeom/kernels/cgal/CgalKernel.cpp b/src/ifcgeom/kernels/cgal/CgalKernel.cpp
index 9c9512ceac..d13dab80ec 100644
--- a/src/ifcgeom/kernels/cgal/CgalKernel.cpp
+++ b/src/ifcgeom/kernels/cgal/CgalKernel.cpp
@@ -300,8 +300,16 @@ bool IfcGeom::CgalKernel::convert_openings(const IfcSchema::IfcProduct* entity,
     }
     
     if (brep_cut_result.is_valid()) {
-      nef_brep_cut_result.convert_to_Polyhedron(brep_cut_result);
-      cut_shapes.push_back(IfcGeom::ConversionResult(new CgalShape(brep_cut_result), &it3->Style()));
+      try {
+        nef_brep_cut_result.convert_to_polyhedron(brep_cut_result);
+        cut_shapes.push_back(IfcGeom::ConversionResult(new CgalShape(brep_cut_result), &it3->Style()));
+      } catch (...) {
+        // Apparently processing the boolean operation failed or resulted in an invalid result
+        // in which case the original shape without the subtractions is returned instead
+        // we try convert the openings in the original way, one by one.
+        Logger::Message(Logger::LOG_WARNING, "Subtracting combined openings compound failed:", entity->entity);
+        return false;
+      }
     } else {
       // Apparently processing the boolean operation failed or resulted in an invalid result
       // in which case the original shape without the subtractions is returned instead